Income Taxes - Schedule of Components of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax [Line Items]
Current tax provision	$ 4,955	$ 634	$ 3,840
Deferred tax provision (benefit):	(173,019)	(10,038)	(79)
Income tax provision (benefit)	(168,064)	(9,404)	3,761
United States Federal
Income Tax [Line Items]
Current tax provision	(1,657)	0	0
Deferred tax provision (benefit):	(172,873)	5,785	5,359
United States And Local
Income Tax [Line Items]
Current tax provision	98	(1,520)	1,375
Deferred tax provision (benefit):	(7,775)	(3,550)	2,877
Foreign
Income Tax [Line Items]
Current tax provision	6,514	2,154	2,465
Deferred tax provision (benefit):	$ 7,629	$ (12,273)	$ (8,315)